但是，和机械泵以及人造心脏一样，干细胞疗法对于治疗心脏病来说也是一种高技术、高成本的解决方案。
But like mechanical pumps and artificial hearts, stem cell therapy is a high-tech, high-expense solution for dealing with heart diseases.
但是当他们注射干细胞进入大鼠心脏，细胞死了，研究者在自然生物技术杂志中报道。
But the cells died when they injected them into the hearts of the rats, the researchers reported in the journal Nature Biotechnology.
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